That is like Chinese to me... I just bought a 3d printer and I noticed at first the preheat pla function did 45 and 185 degrees celcius, after that to45 - 60 and eventually 185 to 200. Now it stays at 45 and 185 degrees celcius. Is that easy to fix???
The only thin in the menus I see that I do not know is : restore failsafe.

This memory can be programmed with your configuration then saved, so every time you start the system it is configured the way you want it.
Restore Failsafe: is the System Default configurations. This is in case you mess up the configuration, to restore failsafe (Default settings).

Just using the Restore Failsafe will not save the settings to EEProm, this requires the use of the store settings (menu item) or M500
You can also set the default PLA /ABS Nozzle and Bed temps and save them to EEProm using
PreHeat PLA config temp
PreHeat ABS config temp
Under Control / Tempature